/*
 * Copyright 2006-2008 the original author or authors.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.osgi.extender.internal.activator;

import java.util.Iterator;
import java.util.List;

import org.springframework.osgi.context.event.OsgiBundleApplicationContextEvent;
import org.springframework.osgi.context.event.OsgiBundleApplicationContextListener;
import org.springframework.util.Assert;

/**
 * Listener interface that delegates to a list of listener. This is useful in
 * OSGi environments when dealing with dynamic collections which can be updated
 * during iteration.
 * 
 * @author Costin Leau
 * 
 */
class ListListenerAdapter implements OsgiBundleApplicationContextListener {

	private final List listeners;


	/**
	 * Constructs a new <code>ListListenerAdapter</code> instance.
	 * 
	 * @param listeners
	 */
	public ListListenerAdapter(List listeners) {
		Assert.notNull(listeners);
		this.listeners = listeners;
	}

	public void onOsgiApplicationEvent(OsgiBundleApplicationContextEvent event) {
		for (Iterator iterator = listeners.iterator(); iterator.hasNext();) {
			OsgiBundleApplicationContextListener osgiListener = (OsgiBundleApplicationContextListener) iterator.next();
			osgiListener.onOsgiApplicationEvent(event);
		}
	}
}
